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High Entropy Intermetallic–Oxide Core–Shell Nanostructure as Superb Oxygen Evolution Reaction Catalyst
Advanced Sustainable Systems ( IF 7.1 ) Pub Date : 2020-02-24 , DOI: 10.1002/adsu.201900105
Zhaoyi Ding 1 , Juanjuan Bian 2, 3 , Shuo Shuang 1 , Xiaodi Liu 1, 4 , Yuanchao Hu 5 , Chunwen Sun 2, 3 , Yong Yang 1, 6
Affiliation  

Designing active, stable, yet low cost electrocatalysts for the oxygen evolution reaction (OER) is pivotal to the next generation energy storage technology. However, conventional OER catalysts are of low electrochemical efficiency while the state‐of‐the‐art nanoparticle‐based catalysts require mechanical supports, thereby limiting their wide deployment. Here, it is demonstrated that, due to the excellent corrosion resistance of the Fe–Co–Ni–Cr–Nb high entropy intermetallic Laves phase, fabricating a high entropy bulk porous nanostructure is possible by dealloying the corresponding eutectic alloy precursor. As a result, a core–shell nanostructure with amorphous high entropy oxide ultrathin films wrapped around the nanosized intermetallic ligaments is obtained, which together, exhibits an extraordinarily large active surface area, fast dynamics, and superb long‐term durability, outperforming the existing alloy‐ and ceramic‐based OER electrocatalysts. The outcome of the research suggests that the paradigm of “high entropy” design can be used to develop high performance catalytic materials.

中文翻译:

高熵金属间化合物-氧化物核-壳纳米结构作为优良的析氧反应催化剂

设计用于析氧反应(OER)的活性,稳定,低成本的电催化剂对于下一代储能技术至关重要。但是,传统的OER催化剂电化学效率低,而最先进的基于纳米颗粒的催化剂需要机械支撑,因此限制了它们的广泛应用。在此证明,由于Fe-Co-Ni-Cr-Nb具有优异的耐蚀性,因此高熵的金属互化物Laves相可以通过脱合金相应的低共熔合金前驱体来制造高熵的块状多孔纳米结构。结果,获得了具有包裹在纳米金属间韧带周围的非晶态高熵氧化物超薄膜的核-壳纳米结构,它们共同展现出异常大的活性表面积,快速的动力学,以及出色的长期耐用性,优于现有的合金和陶瓷基OER电催化剂。研究结果表明,“高熵”设计范式可用于开发高性能催化材料。
更新日期:2020-02-24
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